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Mr. Himanshu Mehta 11 July 2008 Page 5 Phase 5 : Class I Closure Design and Permitting Phase 5 consists of the design, permitting, and construction certification of the closure of the Segment 2 and Infill sideslopes up to El . 95 ft NGVD . For budgeting purposes this task has been divided in the following three tasks , as presented below . Task 5. 1 : Enzineerinz Design Under this phase, Geosyntec will perform engineering analysis and design for closure of the north and south slopes of Segment 2 and the Infill . Engineering analysis and design will be performed to the extent required in the closure permit application . Geosyntec will review, summarize, and synthesize all relevant previous work for the closure of the Class I sideslopes . Geosyntec will perform the following activities as part of the engineering design : • layout and grading of the sideslopes of Segment 2 and Infill ; • specification of components and materials of the final cover system (vegetative layer, cap protective layer, as appropriate) ; • evaluation of percolation through and liquid head build-up in the final cover system using the hydrologic evaluation of landfill performance (HELP) model ; • evaluation of stability and settlement of the final cover system ; • design of the final cover drainage system to collect and convey the water that percolates through the vegetative and cap protective layers ; • design of the surface water drainage system to collect and convey the storm water runoff from the final cover system to the perimeter toe ditch ; • development of typical final cover system details ( configuration of the final cover system at the side slope swales , and other details as appropriate) as required for the permit application ; • development of a construction quality assurance ( CQA) plan ; and • development of financial assurance calculations . XR08168/JL80186. doc '.Ilkllrieers I scientists I innovators